ADP1071 startup intermittent

I have worked with an AD FAE on this design.  I have a ADP1071 using a custom BH mag transformer.  Set up to generate +/-12V out. I have several boards that with the populated componets per schemo, no issues, starts right up....other pcbs it wont start up.

FAE said layout looked good. I had to set OVP to 0V for it to work...(first go at this , it wouldnt start  until I set OVP to 0 volts...).

see page 4 of schemo.

one board, i installed C58 = 100pF and it started up ok.. another board, it wouldnt...

THE vreg VOLTAGE IS definetly on (~ 11V)

kelvin type connections at R83 ande R79 per datasheet.

heavy gnd plane ...on both sides....

under xfrmer cleared out (no copper from top to bottom).

q:  ANY SUGGESTED LAYOUT TOPOLOGY SIMILIAR TO THE WAY LINEAR TECH WOULD GIVE "BASIC" LAYOUT TOPOLOGY?

ANY SUGGESTIONS..?????

PDF

PDF